Type-writing machine.



- Patentd Mam 1.913.

.....i. ==F a FIG. I.

J. 0. MQLAUGH'LIN. I

TYPE'WRITING MACHINE, APPLIGATION IILTBD MAY 7,1912,

Wmwsses: wjfl' UNITED STATESPATENT omrron JOHN c; mmuasa'xn, or inns-Er Jmisnr, assumes TO wmwm rnnwnxrsn courses, or new Yonx, iv. "an CORPORATION or DELAWARE.

'mn-wnrrme MAGHiNE.

1 PatentedMay 27, 1913.

Application media 7, 1912. Serial No. 695,754=.

1' all whom. it may concern:

Be itknown that L'JOHN C. MCLAUGH- LIN, a citizen of the United States, residing in Jersey City, in the county of Hudson and 5 State of New Jersey, have invented certain new and useful Improvements in TypelVriting Machines, of which the following is a specification.

This invention relates to typewriting machines, and more particularly to means for operating from the space-key the escape ment of the carriage feeding device.

In machines such as the Underwood writing machine, the feeding mechanism for the with a pair of dogs mounted on a, rocker.

One of these dogs, knownas the feed dog,

is loosely mounted on the rocker, and is :nor-

wheel and held against a stop provided on the rocker. The other dog, known as the detent dog, is rigidly connected with the rocker and has a beveled face which *engages the escapement tooth when the latter is disengaged from the feed dog by a movement of the rocker. In the usual form of typewriting machine, such as above mentioned, the rocker will be so moved or swung whenever a space-key is depressed. When the key is released, the rocker swings so as to free the esc'apement tooth from the detent wheel and allow the feed dog to engage the next tooth, the carriage thus being fed forward one space. This movement of the rocker is accelerated by the pressure exerted by the escapement wheel against the beveled face of the detent dog, thus making the es-' capement very sensitive. However, should 49 the operator not release the space-key promptly, there is liability of one or more additional teeth escaping past thefeed dog, and the carriage skipping one or more spaces. Moreover, in machines such as above described, the feeding operation has hitherto taken place during the upward movement of the space-key, thus necessitatingthe release of the space-key before anotherty e-key can be operated. This, of course, tends against speed of operation! The principal object of thepresent invention is to eliminate these diificulties, and to this end simple mechanism is provided which prevents the possibility of the escape-- ment wheel skipping a tooth during the op carriage usually embodies an escapement consisting of a toothed wheel cooperating mally engaged by a tooth of the escapement eration' of the space-lrey, and accomplishes this byyausing the cycle of operation'ofthe I escapementmechanisni to be completed dur mg the down stroke of the space-key, and

permitting the rocker to return promptly (if) after being actuated to the limit of its movement. This prompt return of the rocker takes place irrespective as to whether or not the space 'key is kept depressed or is par tially released by the operator. The mech- 6-5 anism provided for this purpose consists essentially of a relatively movable projection operatively connected with .an arm extending from the space-bar, which projection engages a cam projection on the rocker carry--71 ing the dogs of the escapement mechanism. The spacekey, instead of operating the rocker through the universal bar, as in the usual construction of typewriting machine, operates this rocker through the engage- 5.

mentof the projections above mentioned.

\Vhen the space-key is depressed, the mov able projection mounted on the arm extend ing from the space-key engages .the cam projection on the rocker, cams the latter to one 59 side, and then abruptly rides past the same allowing the rocker to promptly return.

Thus the cycle of operation of the escape ment mechanism is completed during the down stroke of the spaoekey, and the can riage is fed forward before the space-key is released. If the operator should then [sit to release the space-key promptly, or, should he release it partially, it willhave no effect on the escapement mechanism, as the latter has completed its cycle of operation and could not be affected by the movement of the space-key until the latter is entirely released and depressed again. Moreover, with the mechanism above described, it will be possible for the operator to operate another type-key before he releases the space-key.

Other objects and advantages will appear hereinaften. In the accompanying drawings; Figure 1 is a longitudinal section elevation of a typewriter with the space-key and the improved connection to the escapement 4 mechanism shown in normal position. Fig. 2 is a per spective view illustrating, in the position of M parts shown in Fig.1, the escapement mechanism and the means for operating it from the space-key. Fig. 3 is a fragm ental View, similar to Fig. 1, illustrating, in an'intermediate posit on, the rocker and the means 119 for operating the same. Fig. 4 is a frag-- mental detail view of the escapement mechanism in an intermediate position, with a tooth of the escapement wheel engaging the beveled face of the detent dog. Fig. 5 is an enlarged section taken about .on line 55 of Fig. 4, and illustrating a position wherein the detent dog is-partially in-the path of a tooth of the escapement wheel.

The space-key 1 has extending therefrom on the other side of its fulcrum, an arm 2 having pivoted thereto adjacent its end a link 3, guided by a pin 4 fixed in a bracket 53 mounted on theframe of the machine. Mounted on this'link is a pivoted stop or pro jection 6, held from movement in one direction by a pin 7 fixed to the link. This stop or projectionfi has a beveled face 8 adapted to engage the beveled face 10 of a cam projection 10 formed on rocker 9 of the escapement mechanism. and through this engagement swings the rocker when the space-key is depressed. The stop 6 is also provided with an abrhpt face 8*, which, after the rocker has been actuated to the limit of its movement, is brought into substantial alinement with an abrupt face 1O provided on the projection 10, as shown in Fig. 3. When the stop 6 rides past the beveled face l0 -of the 'projection on the rocker, the latter is abruptly released and is free to return to its normal position. I

- The general construction ofrocker 9 and the rest of the escapement mechanism is substantially similar to that employed in the usual type of Underwood writing machine now in use. This rocker has mounted thereon the detent dog 11, having the beveled face 12, and the loose orfeed dog 13, which a tooth "5 of the escapementwheel 14 normally engages and holds, in opposition to the tension of spring 17, against a stop 16 formed on the rocker. This spring is fastened to the loose dog at one end and ex; tendsobliquely therefrom to a point onthe frame to which it is fastened, and exerts a tension on the rocker, tending to swing it into normal position, and at the same time serves to pull the loose dog away from the stop when this dog is swung away from its engaging tooth by themovement of. the rocker. The usual universal bar 18 is attached to the rocker," and is operated by the type bars 19 through heels 20 formed thereon adjacent theirffulcrum 21. The escapement wheel "has associated therewiththe usual pinion QQ meshing with the feed rack 23 of the carriage 24:.

When the space-key is depressed, it raises arm 2 and the link carrying the pivoted stop 6. The latter, with its beveled face, engages the cam projection on the rocker, and swings it into thcposition shown in Fig. 3. wherein the feed dog has released a tooth which is in turn engaged by the tlevoled face nected to said space-key 1 rocker, the rocker having aprojection fern d thereon,

masses does the escapement wheel have sufiicient time to skip past the feed dog, and it is assured that the tooth engaging the feed dog is thenext adjacent tooth to the one previously released. The carriage musttherefore feed along but one space at a time, and this movement of the carriage takes place before the space-key is released. When the latter is so released, the pivoted stop rides freely pastthe cam projection on the rocker and has no operative effect thereon. It will thus be clear that the operator can operate another type-key before releasing the spaceke it will be noted that, in the construction above set forth, the space key, in its operation,-does notactuate the ribbon feed.

Variations may be resorted to within the .scope of the invention.

Having thus described my invention, I claim: i

1.. In a typewriting machine having keyoperated types, a carriage, and an escapement mechanlsm therefor constructed to complete its cycle of operation during the return strokes of the type keys, the con1bination with a space-key, of independent devices operated by said space-key for both actuating and. releasing the escapement niechanism duri'ngthe down-stroke of the space- 2. In a typewritlng machine, a. carriage,

escapement mechanism wheel, a rock er, mounted on said ing a beveled face,

including a toothed a feed. dog and detent dog a space-key, means confor swinging said rocker so as to release the toothed wheel from the feed dog and to cause it to engage the beveled face of the-detent dog, said means releasing the rocker during the down-stroke of the space key. Y

3. In a typewritiiig machine, a carriage, escapement mechanism including a rocker, a feed dog and detent dog mounted on this rocker, the rocker having a projection formed thereon, a space-key, mechanism connected to said space-key and including a stop adapted to engage said projection and release it during the downward movement of the spacekey.

a typewriting machine, a carriage, a, feed dog and detent d'og mdiinted on this a space-key, mechanism connected rocker, said detent dog havto said space-key and including a relatively V the movement of the stop in one direction,

said stop being adapted to engage said'projection and release it during the downward movement of the space-key. r

6. In a typewriting machine, a carriage, escapement mechanism including a rocker, a feed do and detent dog mounted on this rocker, t e rockerhaving a projection formed thereon, a space-key, mechanism connected to said space-key and including a pivoted stop, means for limiting the movement of said stop in one direction, said stop being adapted to engage said projection and release it during thedownward movement of the space-key.

7. In atypewriting; machine, a carriage, escapement mechanism including a toothed wheel, a rocker, a feed pawl and detent pawl mounted on said rocker, said detent pawl having a beveled face adapted to engage the teeth of said wheel, a space-key, an arm connected thereto, and a relatively movable stop mounted on said arm and adapted to engage the rocker to actuate the same.

8. In a typewriting machine, a carriage, escapement mechanism including a toothed v Wheel, arocker, a feed pawl and detent pawl mounted on said rocker, said ,det'ent pawl having a beveled face adapted to engage the teeth, of said wheel, a space-key, an arm connected thereto, alink connected to said arm, and a projection on said link adapted to engage the rocker to actuate the same.

9. In a typewriting machine, a carriage,

, escapement mechanism including a toothed wheel, a rocker, a feed pawl and detent pawl mounted on said rocker, said detent pawl having a beveled face adapted to engage the teeth of said wheel, a space-key, an arm connected thereto, a projection or stop mounted on said arm, and a projection formed on said rocker and adapted to be actuated by the first named projection, one of said projections being'relatively movable to its supporting element.

10. In a typewriting machine, a carriage, 'escapement mechanism including a toothed wheel, a rocker, a iced pawl and detent pawl 'with the abrupt face of said projection abruptly free said rocker.

mounted on said rocker, said-detentpawl having a beveled face adapted to engage the teeth of said wheel, a space-key', 'an arm connected thereto, a link connected to said arm, means for guiding said link, a pivoted t or projection mounted on said link, and a do jection on said rocker, said pivoted stop beingadapted to engage said projec-' tion on the rocker and release it during the downward movementof the space key.

11. In a typewriting machine, a carriage, escapement mechanism therefor comprising 5 a toothed. wheel, a rocker, a feed dog and. detent dog mounted on said rocker,the lat-' ter having a projection'thereon, said projection having a beveled face and an abrupt face, a space-key, an arm connected thereto, astop operatively connected with said arm,

said stop having a beveled face adapted to engage the beveled face of said projection to' actuate the rocker, and an abnupt-Jlw-l' face adapted to be brought into alinement 12. In'a typewritmg machine, a carriage,"

escapement mechanism therefor comprising a toothed wheel, a rocker, a feed dog anddetent dog mounted on s'aidrocker, the latter having a projectionthereon, said projection having a beveled face and an abrupt, face, a

space-key, an arm'connected thereto, a relatively movable stop operatively connected -with said arm, said stop'having a beveled face adapted to engage the beveled face of said projection to actuate the rocker, and

an abrupt face adapted to be brought into alinement'with, the abrupt face of said projection to abruptly free said rocker.

'13. In a typewriting machine, acarriage,

escapement mechanism therefor comprising a toothed wheel, a rocker, a feed dog and detent dog mounted on said rocker, said detent dog having a beveled face adapted to engage the teeth of said wheel, said rocker having a projection thereon, said projection having a beveled face and an abrupt face, a space-key, an arm connected thereto, a pivoted stop operatively connected with said arm, means for limiting the movement of saidstop in one direction, said stop having v a beveled face adapted to engage the beveled face of said projection to actuate the rocker, and an abrupt face adapted to be brought into alinement with the abrupt face of said projection to abruptly free said rocker.

JOHN C. MOLAUGHLIN. Witnesses: i G. RIPLEY,

J. LEVY.

Gooiu of this patent may be obtained to! five cents each, by addressing the f communes of Intent.

Wuhingtqmljfi.

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